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xtensa: move coprocessor_flush to the .text section 

coprocessor_flush is not a part of fast exception handlers, but it uses
parts of fast coprocessor handling code that's why it's in the same
source file. It uses call0 opcode to invoke those parts so there are no
limitations on their relative location, but the rest of the code calls
coprocessor_flush with call8 and that doesn't work when vectors are
placed in a different gigabyte-aligned area than the rest of the kernel.

Move coprocessor_flush from the .exception.text section to the .text so
that it's reachable from the rest of the kernel with call8.

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2021-02-25 11:42:46 -08:00
parent a38fd87484
commit ab5eb33641
1 changed files with 33 additions and 31 deletions
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64
arch/xtensa/kernel/coprocessor.S
View File

@ -99,37 +99,6 @@
LOAD_CP_REGS_TAB(6)
LOAD_CP_REGS_TAB(7)
/*
* coprocessor_flush(struct thread_info*, index)
* a2 a3
*
* Save coprocessor registers for coprocessor 'index'.
* The register values are saved to or loaded from the coprocessor area
* inside the task_info structure.
*
* Note that this function doesn't update the coprocessor_owner information!
*
*/
ENTRY(coprocessor_flush)
/* reserve 4 bytes on stack to save a0 */
abi_entry(4)
s32i a0, a1, 0
movi a0, .Lsave_cp_regs_jump_table
addx8 a3, a3, a0
l32i a4, a3, 4
l32i a3, a3, 0
add a2, a2, a4
beqz a3, 1f
callx0 a3
1: l32i a0, a1, 0
abi_ret(4)
ENDPROC(coprocessor_flush)
/*
* Entry condition:
*
@ -245,6 +214,39 @@ ENTRY(fast_coprocessor)
ENDPROC(fast_coprocessor)
.text
/*
* coprocessor_flush(struct thread_info*, index)
* a2 a3
*
* Save coprocessor registers for coprocessor 'index'.
* The register values are saved to or loaded from the coprocessor area
* inside the task_info structure.
*
* Note that this function doesn't update the coprocessor_owner information!
*
*/
ENTRY(coprocessor_flush)
/* reserve 4 bytes on stack to save a0 */
abi_entry(4)
s32i a0, a1, 0
movi a0, .Lsave_cp_regs_jump_table
addx8 a3, a3, a0
l32i a4, a3, 4
l32i a3, a3, 0
add a2, a2, a4
beqz a3, 1f
callx0 a3
1: l32i a0, a1, 0
abi_ret(4)
ENDPROC(coprocessor_flush)
.data
ENTRY(coprocessor_owner)